Can't Buy Subscription

Good day Blizzard team,

I can’t seem to complete the transactions for 6 months subscription of World of Warcraft. I always get the same error when trying to purchase it “We encountered an issue completing your transaction. Please try again later. If the issue persists, please click here.”.

I tried multiple times but to no avail, I even tried to delete my payment method and added it again, but another error occurred, “An error occurred.” when I try to add it.

Can I please purchase the subscription and be able to play the game? WoW really gave me a good break through tough times.